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  "body": "\n## Problem\n\n**Problem 3 (Goodearl 1991).** Is the positive cone of any dimension group with [[order-unit|0N6R902FG1]] isomorphic to *V(R)*, for some von Neumann regular ring *R*?\n\n* * *\n",
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        "locator": "Congruence lattice problem, section Congruence lattices of lattices and nonstable K-theory of von Neumann regular rings",
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  "name": "Problem 3 (Goodearl 1991)",
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